00001 /*This file is prepared for Doxygen automatic documentation generation.*/ 00015 /* Copyright (c) 2009 Atmel Corporation. All rights reserved. 00016 * 00017 * Redistribution and use in source and binary forms, with or without 00018 * modification, are permitted provided that the following conditions are met: 00019 * 00020 * 1. Redistributions of source code must retain the above copyright notice, this 00021 * list of conditions and the following disclaimer. 00022 * 00023 * 2. Redistributions in binary form must reproduce the above copyright notice, 00024 * this list of conditions and the following disclaimer in the documentation 00025 * and/or other materials provided with the distribution. 00026 * 00027 * 3. The name of Atmel may not be used to endorse or promote products derived 00028 * from this software without specific prior written permission. 00029 * 00030 * 4. This software may only be redistributed and used in connection with an Atmel 00031 * AVR product. 00032 * 00033 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED 00034 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00035 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE 00036 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR 00037 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 00038 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00039 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00040 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00041 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00042 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE 00043 * 00044 */ 00045 00046 #include "dsp.h" 00047 00048 static int seed = 123456789; 00049 00050 // Get the reference's value to compute a pseudo-random number 00051 void dsp_op_srand(int new_seed) 00052 { 00053 if (new_seed == 0) 00054 new_seed = 1; 00055 seed = new_seed; 00056 } 00057 00058 #if defined(FORCE_ALL_GENERICS) || \ 00059 defined(FORCE_GENERIC_OP16_RAND) || \ 00060 !defined(TARGET_SPECIFIC_OP16_RAND) 00061 00062 // Generate a 16-bit pseudo-random number from a reference's value 00063 dsp16_t dsp16_op_rand() 00064 { 00065 // Park and Miller Minimal Standard 00066 seed = 16807*seed; 00067 return (dsp16_t) (seed >> (DSP16_QA-1)) & (((U16) -1) >> (DSP16_QA-1)); 00068 } 00069 00070 #endif 00071 00072 #if defined(FORCE_ALL_GENERICS) || \ 00073 defined(FORCE_GENERIC_OP32_RAND) || \ 00074 !defined(TARGET_SPECIFIC_OP32_RAND) 00075 00076 // Generate a 32-bit pseudo-random number from a reference's value 00077 dsp32_t dsp32_op_rand() 00078 { 00079 // Park and Miller Minimal Standard 00080 seed = 16807*seed; 00081 return (dsp32_t) (seed >> (DSP32_QA-1)) & (((U32) -1) >> (DSP16_QA-1)); 00082 } 00083 00084 #endif